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Table 2 Characterization of the syllids assemblages identified on the Portuguese coast (Western Iberia)

From: Diversity, distribution and ecology of the family Syllidae (Annelida) in the Portuguese coast (Western Iberian Peninsula)

Affinity groups A1 A2 B
No. of sampling sites 31 24 30
Substrate type Coarser shelf sediments Finer shelf sediments Kelp holdfasts
Sediment type VCS (11/31); CS (7/31); G (7/31); MS (3/31); FS (2/31); n.a. (1/31) FS (13/24); M (9/24); MS (5/24); VFS (4/24); VCS(3/24); CS (1/24)
Gravel content (mean; %) 26.5 2.6
Sand content (mean; %) 69.7 61.8
Fines content (mean; %) 3.7 35.5
TOM content (mean; %) 1.2 4.3
Depth (mean; m) 57.8 70.8 0
Max holdfast diameter (mean; cm) 21.7
Holdfast area (mean; cm2) 188.9
Holdfast volume (mean; cm3) 198.7
Abundance (mean) 38.7 10.2 28.2
Total species richness 31 16 33
Mean species richness 7.5 2.5 8.2
No. of exclusive species 16 2 19
Characteristic species
(with Constancy and Fidelity indications)
Sphaerosyllis bulbosa (Cn/P)
Syllis pontxioi (Cn/E)*
Trypanosyllis coeliaca (Cn/E)
Eurysyllis tuberculata (Cn/P)
Odontosyllis gibba (C/E)*
Palposyllis prosostoma (C/E)*
Plakosyllis brevipes (C/E)*
Syllis garciai (Cn/I)
Streptodonta pterochaeta (O/E)*
Syllis licheri (O/E)*
Parapionosyllis brevicirra (C/P)
Syllis mercedesae (C/P)
Syllis garciai (Cn/A)
Sphaerosyllis taylori (O/I)
Syllis armillaris (O/I)
Exogone (Exogone) naidina (R/I)
Parexogone gambiae (R/E)*
Parexogone hebes (R/E)*
Eurysyllis tuberculata (R/A)
Haplosyllis spongicola (R/A)
Brania pusilla (Cn/E)*
Myrianida brachycephala (Cn/E) Sphaerosyllis hystrix (Cn/P)
Syllis krohni (Cn/E)*
Syllis variegata (Cn/E)*
Synmerosyllis lamelligera (Cn/I)
Odontosyllis ctenostoma (C/E)*
Syllis alternata (C/E)*
Syllis corallicola (C/E)*
Amblyosyllis formosa (O/E)*
Most abundant species (top ten) Sphaerosyllis bulbosa
Syllis garciai
Trypanosyllis coeliaca
Syllis pontxioi*
Eurysyllis tuberculata
Synmerosyllis lamelligera*
Opisthodonta serratisetosa*
Syllis armillaris
Sphaerosyllis hystrix
Sphaerosyllis taylori
Syllis garciai
Parapionosyllis brevicirra
Syllis mercedesae
Sphaerosyllis taylori
Syllis armillaris
Haplosyllis spongicola
Parexogone gambiae*
Exogone (Exogone) naidina
Sphaerosyllis bulbosa Eurysyllis tuberculata
Brania pusilla*
Sphaerosyllis hystrix
Myrianida brachycephala
Syllis garciai
Synmerosyllis lamelligera
Syllis krohni *
Syllis variegata*
Syllis alternata*
Syllides edentatus
Syllis corallicola*
  1. Mean values are reported to the unit sampling area for the soft-bottom samples (0.1 m2) and per holdfast. The top 10 characteristic species in each group were defined according to the highest product between constancy and fidelity
  2. Sediment types: G gravel, VCS very coarse sand, CS coarse sand, MS medium sand, FS fine sand, VFS very fine sand, M mud, TOM total organic matter, Constancy: Cn constant, C common, O occasional, R rare, Fidelity: E elective, P preferential, I indifferent, A accessory, * = exclusive species in each group, – = not applicable, n.a. not available data